All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
It is permissible for a Muslim to ask his/her fellow Muslim to supplicate for him/her in regard to any worldly matter or any matter of the Hereafter.
For more benefit, please refer to Fatwa 103129.
We ask Allaah to bless you with righteous progeny as He is The Hearer of supplication, and we ask Allaah to facilitate the matter for your Muslim sister in finding a house in a permissible way.
Allaah Knows best.